Elenco Snap Circuits FM Radio &reg - Manual

The Snap Circuits Kit uses electronic blocks that snap onto a clear plastic base grid to build different
circuits. These blocks have different colors and numbers on them so that you can easily identify them.
Build the circuit shown by placing all the parts with a black
1 next to them on the clear plastic base grid
first. Then, assemble parts marked with a 2, then parts marked with a 3, and finally, parts marked with
a 4. Install three (3) “AA” batteries (not included) into the battery holder (B3).
Turn on the slide switch (S1) and press the R button on the FM module (FM). Now press the T button
and the FM module scans for a radio station. When a station is found, it locks on to it and you hear it
on the speaker (SP). Adjust the volume using the adjustable resistor (RV). The resistor controls the
amount of signal into the power amplifier (U4). Press the T button again for the next radio station. The
module will scan up to 108MHz, the end of the FM band, and stop. You must then press the R button
to reset at 88MHz again.
Modify the circuit shown by removing the 2-snap wire and the single
snap that are connected to the FM module (FM), note that the single
snap is beneath the adjustable resistor (RV).
Position the adjustable resistor (RV) at the top and turn on the slide
switch. You should be able to touch point A with your finger and hear
static. Listen closely to the speaker (SP) or wet your finger if you don’t
hear any sound. High frequency clicks, static or even an AM radio
station should be coming from speaker indicating that the amplifier is
powered on and ready to amplify signals.
The power amplifier may oscillate on its own. Do not worry, this is
normal with high-gain, high-powered amplifiers.
If you have any problems, contact Elenco ®
Copyright © 2005 Elenco ® Electronics, Inc. All Rights Reserved. • 150 Carpenter Ave. • Wheeling, IL 60090
(800) 533-2441 Fax: (847) 520-0085 • e-mail: [email protected] • Web site: www.elenco.com or www.snapcircuits.net
P Prroojjeecctt ##11 FFM M R Raaddiioo
P Prroojjeecctt ##22 Power Amplifier
Use the circuit from project 2. When you place one finger on point A and
a finger from your other hand on the point B, what happens? If the
amplifier starts to oscillate, it is due to the fact that you just provided a
feedback path to make the amplifier into an oscillator. You may even be
able to change the pitch of the oscillation by pressing harder on the
snaps.
This is the principle used to make an electronic kazoo. If you practice
and learn the amount of pressure required to make each note, you may
even be able to play a few songs.
P Prroojjeecctt ##33 Electronic Kazoo
Use the circuit from project 3.
Turn on the slide switch (S1) and place one finger on point C and a
finger from your other hand on point B. The trombone should start
playing due to the fact that you just provided a feedback path to make
the amplifier into an oscillator. To change the pitch of the sound, simply
slide the adjustable resistor (RV) control back and forth. By moving the
slider, you will be able to play a song much like a trombone player
makes music. The RV control is the same as a trombone slider bar. The
circuit may be silent at some positions of the resistor control.
P Prroojjeecctt ##44 Trombone
WARNING: SHOCK HAZARD -
Never connect Snap Circuits
to the electrical outlets in your
home in any way!
WARNING: Always check your wiring before
turning on a circuit. Never leave a circuit
unattended while the batteries are installed.
Never connect additional batteries or any other
power sources to your circuits.
FM Radio
Model SCP-02
753141
REV-A